radiationless transition

简明释义

无辐射跃迁

英英释义

例句

1.Understanding radiationless transitions 无辐射跃迁 is crucial for improving the performance of solar cells.

理解radiationless transitions 无辐射跃迁 对于提高太阳能电池的性能至关重要。

2.In fluorescence microscopy, radiationless transitions 无辐射跃迁 can limit the brightness of fluorescent dyes.

在荧光显微镜中，radiationless transitions 无辐射跃迁可能限制荧光染料的亮度。

3.In photophysics, a process called radiationless transition 无辐射跃迁 can occur when a molecule returns to its ground state without emitting a photon.

在光物理学中，一种称为radiationless transition 无辐射跃迁的过程可以发生，当分子在不发射光子的情况下返回基态。

4.In organic compounds, radiationless transitions 无辐射跃迁 help in the rapid internal conversion of excited states.

在有机化合物中，radiationless transitions 无辐射跃迁 有助于激发态的快速内部转换。

5.The efficiency of certain lasers can be affected by the occurrence of radiationless transitions 无辐射跃迁 between energy levels.

某些激光的效率可能受到能级之间发生的radiationless transitions 无辐射跃迁的影响。

作文

In the fascinating world of quantum mechanics and molecular physics, one encounters a variety of phenomena that challenge our classical understanding of energy transfer. Among these phenomena is the concept of radiationless transition, which refers to a process where an excited molecule returns to its ground state without emitting a photon. This mechanism plays a crucial role in various chemical and physical processes, influencing everything from the efficiency of solar cells to the behavior of fluorescent dyes.To understand radiationless transition, it is essential to grasp the fundamental principles of molecular excitation. When a molecule absorbs energy, it can be promoted to an excited state. Typically, this process involves the absorption of a photon, which provides the necessary energy for the transition. However, once in the excited state, the molecule may not always release this energy in the form of light. Instead, it can undergo a radiationless transition, where the energy is dissipated through non-radiative pathways.One common type of radiationless transition is known as internal conversion. During internal conversion, the excited molecule transfers its energy to vibrational modes of the same molecule, leading to a rapid relaxation back to the ground state. This process occurs on extremely short timescales, often in the order of picoseconds. As a result, the molecule does not emit light, making it challenging to detect these transitions experimentally.Another important mechanism related to radiationless transition is intersystem crossing. This process involves a transition between different electronic states of a molecule, specifically from a singlet state to a triplet state. Intersystem crossing can also occur without the emission of photons, allowing the molecule to explore different energy landscapes before returning to the ground state. This phenomenon is particularly significant in photochemistry, where the efficiency of energy transfer can greatly affect the outcome of chemical reactions.The implications of radiationless transition are vast and varied. In the field of photovoltaics, for instance, understanding how to minimize radiationless transitions can lead to more efficient solar cells. By optimizing the materials used and their structural properties, researchers aim to enhance the likelihood of radiative transitions, thereby increasing the overall energy conversion efficiency.Moreover, in the realm of fluorescence, radiationless transitions can significantly impact the brightness and lifespan of fluorescent dyes. When designing new fluorescent probes for biological imaging, scientists must consider these transitions to ensure that the emitted light is strong and detectable. The balance between radiative and non-radiative processes can dictate the performance of these dyes in practical applications.In summary, the concept of radiationless transition is a critical aspect of modern chemistry and physics. It encompasses various mechanisms that allow molecules to return to their ground state without emitting light, influencing a wide range of applications from solar energy to biological imaging. As research continues to delve deeper into these phenomena, our understanding of molecular interactions and energy transfer will undoubtedly expand, paving the way for innovative technologies and advancements in science.

在量子力学和分子物理的迷人世界中，人们会遇到各种现象，这些现象挑战着我们对能量转移的经典理解。其中一个现象就是无辐射跃迁的概念，它指的是一种过程，激发态的分子在不发射光子的情况下回到基态。这种机制在各种化学和物理过程中的作用至关重要，影响着从太阳能电池的效率到荧光染料的行为等方方面面。要理解无辐射跃迁，首先需要掌握分子激发的基本原理。当一个分子吸收能量时，它可以被提升到激发态。通常，这一过程涉及光子的吸收，为跃迁提供必要的能量。然而，一旦处于激发态，分子并不总是以光的形式释放这种能量。相反，它可以经历无辐射跃迁，通过非辐射途径耗散能量。一种常见的无辐射跃迁类型称为内部转化。在内部转化过程中，激发的分子将其能量转移到同一分子的振动模式上，导致迅速回到基态。这个过程发生在极短的时间尺度上，通常在皮秒级别。因此，分子不会发出光，使得实验上检测这些跃迁变得具有挑战性。与无辐射跃迁相关的另一个重要机制是系间交叉。这个过程涉及分子不同电子态之间的跃迁，特别是从单重态到三重态的跃迁。系间交叉也可以在不发射光子的情况下发生，使分子能够在返回基态之前探索不同的能量景观。这种现象在光化学中尤为重要，因为能量转移的效率可能会严重影响化学反应的结果。无辐射跃迁的影响范围广泛而多样。例如，在光伏领域，理解如何最小化无辐射跃迁可以导致更高效的太阳能电池。通过优化所使用的材料及其结构特性，研究人员旨在增强辐射跃迁的可能性，从而提高整体能量转化效率。此外，在荧光领域，无辐射跃迁可以显著影响荧光染料的亮度和寿命。在设计用于生物成像的新荧光探针时，科学家必须考虑这些跃迁，以确保发出的光强且可检测。这些染料在实际应用中的性能可以由辐射和非辐射过程之间的平衡决定。总之，无辐射跃迁的概念是现代化学和物理学的一个关键方面。它涵盖了各种机制，使分子能够在不发光的情况下回到基态，影响从太阳能到生物成像的广泛应用。随着研究继续深入这些现象，我们对分子相互作用和能量转移的理解无疑将扩展，为创新技术和科学进步铺平道路。